Ubuntu18 PCI device driver development crashed, we have a good development collection card on WIndows, PCIE by 8 interface, based on Xilinx Kintex7, in Dell Power edge R740 DMA transmission on the server machine is jammed, unresponsive, same driver interface X4 acquisition card, can run normally, but will not appear intermittently caton a DMA transfer takes a few seconds, a DMA interrupt normal response mainly about 40 milliseconds, can be paid, contact QQ271345870 thank you!